Wordpress Disable Comments (add to function.php)

function.php

<?php
/**
 * コメント機能の無効化
 *
 * @package MHICustom
 */

add_action(
	'admin_init',
	function () {
		// Redirect any user trying to access comments page.
		global $pagenow;

		if ( $pagenow === 'edit-comments.php' ) {
			wp_redirect( admin_url() );
			exit;
		}

		// Remove comments metabox from dashboard.
		remove_meta_box( 'dashboard_recent_comments', 'dashboard', 'normal' );

		// Disable support for comments and trackbacks in post types.
		foreach ( get_post_types() as $post_type ) {
			if ( post_type_supports( $post_type, 'comments' ) ) {
				remove_post_type_support( $post_type, 'comments' );
				remove_post_type_support( $post_type, 'trackbacks' );
			}
		}
	}
);

// Close comments on the front-end.
add_filter( 'comments_open', '__return_false', 20, 2 );
add_filter( 'pings_open', '__return_false', 20, 2 );

// Hide existing comments.
add_filter( 'comments_array', '__return_empty_array', 10, 2 );

// Remove comments page in menu.
add_action(
	'admin_menu',
	function () {
		remove_menu_page( 'edit-comments.php' );
	}
);

// Remove comments links from admin bar.
add_action(
	'init',
	function () {
		if ( is_admin_bar_showing() ) {
			remove_action( 'admin_bar_menu', 'wp_admin_bar_comments_menu', 60 );
		}
	}
);